Troubleshooting DC circuits: if the measured current in a simple series circuit is 0 A (zero), which condition is most likely present?

Introduction / Context:
Recognizing fault types quickly (open vs short) is essential in diagnostics. Zero current often points to a specific failure mode with clear corrective actions.

Given Data / Assumptions:

• DC source present and capable.
• Series path for current must be continuous to allow flow.
• Ohm’s law applies: I = V / R_total.

Concept / Approach:
An open circuit breaks the conductive path, making R_total effectively infinite. With finite source voltage, current I approaches zero. In contrast, a short circuit reduces R_total, increasing current drastically rather than dropping it to zero.

Step-by-Step Solution:
Zero current observed → consider I = V / R_total.For I → 0 with finite V, R_total must be extremely large → open circuit.Therefore, the most probable cause is a disconnected wire, blown fuse, or open switch.

Verification / Alternative check:
Measure voltage across the suspected open. A full source voltage appearing across a break corroborates an open-circuit diagnosis.

Why Other Options Are Wrong:
Short: would cause very large current, not zero.
Too high voltage or too low resistance: both would increase current, not eliminate it.

Common Pitfalls:
Assuming failed source instead of checking continuity; misinterpreting a faulty meter reading when on the wrong range.

Final Answer:
circuit is open